Dental anchoring method and device



Jan. i4, 1930. I H. BOATNER 1,743,910 DENTAL ANCHORING' METHOD AND bEvICE Filed July 23. 1928 19010: fioainaz? Patented Jan. 14, 1930 HOWELL BOA'INER, 0F SPRINGFIELD, MISSOURI DENTAL AiKTdHOfiIN'G METHOD AND DEVfCIE This inv'entieh relates to dentistry, and its geneial object is to provide an improved method of ancherihg cast metallic inlays and crowns to teeth iii a manner w ereby the in A further Object oi the invention is t o previde e novel method of forming cavities in teeth in lji'epttrir'ig them for inlays 25,1161 the 1'6 like, the cavities being fetmed iii a inaiiher to not only keep the pulp alive and to retain the investing tissue healthy e ceii'ditidn but also t6 efieetiiieljr, iiifii'lye-ild 'sectirely re eive 2th enghofing means which toepe'fiites with the walls 6f the cavity to rete iri ii liys with ctbtviis and hii gee secured thei'ete or the crowns seeufed directlyto the teeth in mannef wheiehy they Will resist stress in til directions. w t i Ar'iother ehje'et of the ihvefitieh is to pre- Vide 'ineta'llic anchorihg iheztns for seetitely receii ir'igihlays eiewhs and the like, arid coepefates Withthe nevel a rangement Of the walls of the cavity so that th strain is put 25 upon the stt'eiigest pert of theteeth Wheri the ihlays and Crowns and the like are used tot sup orting hiidge's.

A further 0h]ect of the invention is to' provide anchoi'uig ean that 1S S1H1 p le "9.0 in ednsjtruetien, ihexpehsii e to manufacture,

and efficientin operation and seiv'ice.

This inventioil also e eilsists ii certa'in other methods and featuies of Construction and in h the comhinzttion'and arr ngement of the sev; e 'al parts to he hereinafter fully described, illustrated ii the acc mpanying di'awir'igs and speeifiiany pointed out in the appended claims. 'f

Indeseiihifig ihyihvehtion in detail, refe el'iee will he had to'the eeeolhpeiiyihg drewings Whereifi like eheifecters denote like ()1: eofi'iespofidifig parts throughout the seveiel views, which: 1 t

Figured is 'fmgriientm y" seetienel View taken through a tooth and illustfeltesfah inlay aiichdred thei'ei'n n'eve'l iheth'o'd' a 'id ahehoi'il'i i means with the of the" may le'ftfor"the impressiq i df the hiidge.

Figure 2 is a view illjistfeitin'gthe teethpie- 1922. Seriei 1&0. 294;?65.

method ahd illustiates the iiiet stllie antihdfihg meztns eeeui'edthefeiri; v t v,

Figure 3 i a sectional view taken through the ihlay' in the ferii zts showii in Figure 1 and illustifetes the reamifig drill iil' use for' sheath iiig out the bore which is for ified $01 the amchoriti'g' nut.

Fight-e4 is pefspectii e View (it (me fem of the ziiiehoring means with theiiutferfieyed.

Figure 5 is a; siihilar view (if the alhehdi ing nut.

Figure ti is a siiiiilttf view of the screw driver that is used uponthe nut.

Figuie 7 is a medified fox-iii of anchefihg means with the net hemmed.

Figfire 8 illustrzttee the fo'i'm bf ii neho'i'ihg nieihs as shmvn in Figufe 7 in seeuted position in a teeth. I

While I hate ShtiWil' e irielii prejgitt'ed with a c'tiritf; fqrihed in decad nce with iii) inveiltioii, with 2th iiilzty secured ii said ezivity, as ite-ll es the eitarigeineht of hij eii'che ing' device, I Want it und'eistood that tin type of tooth eai'i he p epared igtcordinfily fer receivingthe aheheiing device and iiilays Without departing from the spirit of the inifehtieri. While the eavity they be foimed iii healthy tooth fol the p'uipdse 0f ac'eemniedeting the ifila y and tnehorihg device, the natui-al uiider-euts produced by decay may be finished and prepared iii the same manner. L

Refeftihg t6 the dravi ings in detail the letter A indieeites a frielai hwing' a Cavity formed therein in su bstefitieny step tometion and iii tce'e'rdan'ee with methcid. The cavity ineludes a vertical wall 1 and (i horizontal Wall 2 which niekeupthe eeclusal step, an axial Wall 3 and a base Wall 4. The a xizil Wall and base wall may he laterally cut as alt-5 for the purpose bf accommodating theflet bj0dy'6 of the aincherin g device which also includes a stem 7 formed with screw threads as clearly sh Wn in Figures 4 and 7 of the drawings. The anchofingdetice as shevt'fi iii: Figu'i e 45 is illustrz'itedin applied positing: iftFigufe 1, end the seen? may he e d tqfl e'bfidi'fsb 5 t e i e d l -r'fi iii desired 'diitioh it dtihiifiifig 6f course upon the tooth and the condition thereof as well as the manner in which it is de sired to secure the inlay or crown to the tooth as will be apparent.

The inlay which is indicated by the reference numeral 8 is cast to fit the cavity and of course has a portion or portions shaped for fitting engagement with the respective walls of the cavity as Well as the built up portions and the material used in securing the anchoring device in operative position, as shown in Figure 1 of the drawings.

When the inlay is cast, a sprue 9 is formed therewithso as to provide appropriate means for making the impression for a bridge, and in the process of casting the inlay a conical shaped bore 10 is formed therein for the purpose of accommodating a conical shape nut 11 which is threadedly received by the screw threads of the stem 7, and this nut together with the remaining portion of the anchoring means and shape of the cavity secure the inlay in the cavity in a manner whereby it will resist stress in all directions, with the result a bridge can be secured to the inlay without fear of separation of the inlay from the tooth or breakage or other damage thereto.

For the purpose of applying and removing the nut to and from the stem 7, I provide a screw driver such as shown in Figure 6, and this screw driver includes a handle 12 which tapers at one end to provide a shank 13. The shank 13 is flattened and formed with a slot 14 to provide spaced parallel arms 15 for the urpose of being received in a transverse- 1y disposed slot 16 arranged in the large upper end of the nut which is shown in Figure 5. Sometimes I make use of a sleeve (not shown) with the screw driver to assist in holding the nut, and the sleeve is provided with cooperating spring fingers curved toward each other.

In Figure 8 I have illustrated a slightly different arrangement of the body and screw stem portions of my anchoring device. and in this figure it will be noted that the body is fixed to the horizontal wall 2 of the occlusal step and the stem is arranged with respect to the step in the manner as shown in Figure 7.

This arrangement may be used for securing crowns such as shown in Figure 9, but in order to secure the crown referred to and whichis indicated by the reference numeral 17 to a tooth, the stem must be arranged so as to pass centrally through the bore 18 of the crown whereby it will be in a position to receive the nut 11 in the same manner as illustrated in Figure 1.

\Vhen the inlays or crowns are cast, the bores thereof may be rough and I employ a reaming drill such as indicated by the reference numeral 19 for smoothing the bore so that the nut will be disposed in fitting engagement therewith as will be apparent when the latter is threadedly secured to the stem.

The method for making the inlays whereby they conform to the shape of the prepared tooth with the anchoring means secured thereto, and the manner of fixing the anchoring means in the tooth will now be described. The cavity is formed in accordance with the method above set forth and as suggested in Figures 1 and 2 of the drawings, the body 6 of the anchoring means is fitted in position, and the stem is soldered thereto at the proper angle. The stem is then cut off at the proper length for the occlusion, and the body is cemented in position. Any under-cuts is filled with amalgam or other material, so that the wax pattern can be readily removed from the cavity without distortion thereof. The conical shape nut is disposed upon the stem, thence the inlay wax is forced under and around the 'nut and into the rest of the cavity for making a wax pattern. This pattern is formed in the same manner as an ordinary two surface inlay pattern. After the wax is chilled the nut is unscrewed by means of the screw driver above referred to, the wax is then removed and cast. After casting the inlay or crown will have a cone shape hole disposed therein to accommodate the nut. The inlay is placed in the cavity and held in position by means of the nut, or wax is melted about the stem and into the hole, for the purpose of temporarily holding the inlay in, place while an impression is made for a bridge.

The bridge is. made in the ordinary way now commonly employed, and after the bridge is made, it is cemented in place. While the cement is still soft the nut is disposed on its stem, with the result the inlay is not only held securely to the tooth, through the medium of the novel form of cavity as well the anchoring device, but the bridge will be held accordingly.

The crown is formed, made, fitted and secured in the same manner, and a bridge may be secured thereto accordingly, but of course a cavity is not formed in the tooth for accommodating the crown unless it is necessary for removing decayed parts, jagged or irregular edges and the like.

It is thought from the foregoing description that the advantages and novel features of my invention will be readily understood.

I desire it to be understood that I may make changes in the method and construction, and in the combination and arrangement of the several parts and steps of the method, provided that such changes fall within the scope of the appended claims.

What I claim is:

1. A method of securing inlays to teeth by forming a cavity in a tooth in a manner to provide stepped walls arranged therein so as to keep the pulp alive and to retain the investing tissues in a healthy condition,

under-cutting two of said walls, securing anchoring means including a threaded stem to any of the walls, filling the under-cuts with amalgam, threading a conical nut upon the stem, forcing wax under and around the nut and in the cavity to form a pattern for an inlay, unscrewing the nut after the wax is chilled, removing the chilled wax and using the same for making a cast, forming an inlay from the cast and leaving a sprue thereon, said inlay being provided with a conical bore formed by the cast being made from the wax pattern, fitting the inlay in position in the cavity, temporarily securing the inlay in place, making an impression for a bridge from the sprue, tooth and inlay, forming the bridge from the impression, fixing the inlay to the bridge, cementing the bridge with the inlay to the tooth, and screwing the nut in place while the cement is soft.

2. A method of securing inlays to teeth for fixing a bridge thereto, by preparing a stepped cavity in a tooth, said cavity includ ing a vertical wall, a horizontal wall extending from the vertical wall, a base wall below the horizontal wall, an axial wall connecting the base wall with the horizontal wall, undercutting the aXial and base walls if necessary, securing the body portion of an anchoring means to any of the walls and under-cut portions, securing a threaded stem to the body of the anchoring means at any desired angle with respect thereto, cutting oi? the stem at the proper length, filling the undercuts with amalgam, threading a conical nut upon the stem, forcing wax under and around the nut and in the cavity to form a pattern, unscrewing the nut after the wax is chilled, removing the chilled wax and using the same for making a cast, forming an inlay from the cast and leaving a sprue projection upon the inlay, placing the inlay in position in the cavity, temporarily securing the inlay in place, making an impression for a bridge from the sprue, tooth and inlay, forming the bridge from the impression, cementing the bridge to the tooth and inlay, and securing the nut permanently to the stem while the cement is soft.

In testimony whereof Iaifix my signature.

HOWELL BOATNER. 

